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Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Allanite-(Ce) from
Linkpot cut, Airline Railroad, East Hampton, Middlesex County, Connecticut, USA


01237100017339888363459.jpg
Allanite-(Ce), etc.

Linkpot cut, Airline Railroad, East Hampton, Middlesex County, Connecticut, USA
04992210017272039795861.jpg
Allanite-(Ce), etc.

Linkpot cut, Airline Railroad, East Hampton, Middlesex County, Connecticut, USA
06937560017272039812588.jpg
Allanite-(Ce), etc.

Linkpot cut, Airline Railroad, East Hampton, Middlesex County, Connecticut, USA
08425710017272039821868.jpg
Allanite-(Ce), etc.

Linkpot cut, Airline Railroad, East Hampton, Middlesex County, Connecticut, USA
01237100017339888363459.jpg
Allanite-(Ce), etc.

Linkpot cut, Airline Railroad, East Hampton, Middlesex County, Connecticut, USA
00141860017364029875572.jpg
Allanite-(Ce), etc.

Linkpot cut, Airline Railroad, East Hampton, Middlesex County, Connecticut, USA
06542950017365616743836.jpg
Allanite-(Ce), etc.

Linkpot cut, Airline Railroad, East Hampton, Middlesex County, Connecticut, USA
01685760017365616754941.jpg
Allanite-(Ce), etc.

Linkpot cut, Airline Railroad, East Hampton, Middlesex County, Connecticut, USA
01237100017339888363459.jpg
Allanite-(Ce), etc.

Linkpot cut, Airline Railroad, East Hampton, Middlesex County, Connecticut, USA
04992210017272039795861.jpg
Allanite-(Ce), etc.

Linkpot cut, Airline Railroad, East Hampton, Middlesex County, Connecticut, USA
06937560017272039812588.jpg
Allanite-(Ce), etc.

Linkpot cut, Airline Railroad, East Hampton, Middlesex County, Connecticut, USA
07768250017362267172572.jpg
Allanite-(Ce), etc.

Linkpot cut, Airline Railroad, East Hampton, Middlesex County, Connecticut, USA
Classification
Species:Allanite-(Ce)
Formula:(CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH)
Comments:Very sharp terminated crystals crystals, up to half an inch in diameter and five or six inches in length, accompany pink fluorite. Massive material also occurs, intergrown with quartz, bastnaesite, pyrite, chalcopyrite, and white to greenish plagioclase (commonly stained brown). The allanite is not very radioactive and was identified by an x-ray diffraction test by Mary E. Mrose of the U. S. Geological Survey. She indicated that it gave an exceptionally clear pattern. It was obviously non-metamict, in keeping with its unaltered appearance and virtual lack of radioactivity. Note: Schooner misidentified these as staurolite in Zodac (1940).
Habit:elongated prisms
Colour:black, very dark brown
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Common
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Albite8
Quartz6
Chalcopyrite2
Muscovite2
Bastnäsite-(Ce)1
Microcline1
Data
Mineral Data:Click here to view Allanite-(Ce) data
Locality Data:Click here to view Linkpot cut, Airline Railroad, East Hampton, Middlesex County, Connecticut, USA
Photo GalleryView Gallery (11 photos)
Data Identifiers
Mindat Occurrence Record ID:712656
Long-form Identifier:1:3:712656:7
GUID (UUID V4):0
Nearest other occurrences of Allanite-(Ce)
9.3km (5.7 miles) ⓘStrickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
10.6km (6.6 miles) ⓘWalden Gem Quarry, Portland, Middlesex County, Connecticut, USA
10.6km (6.6 miles) ⓘConnecticut Yankee atomic power plant, Haddam Neck, Haddam, Middlesex County, Connecticut, USA
11.5km (7.1 miles) ⓘAndrews Quarry (old Hale Quarry; Grandfather Andrews Quarry), Portland, Middlesex County, Connecticut, USA
32.8km (20.4 miles) ⓘCharter Oak Federal Credit Union construction site, Waterford, New London County, Connecticut, USA
36.0km (22.4 miles) ⓘFlatrock Quarry (Flat Rock Quarry; Crystal Mall), Waterford, New London County, Connecticut, USA
59.8km (37.2 miles) ⓘSmith Granite quarry, Westerly, Washington County, Rhode Island, USA
59.9km (37.2 miles) ⓘRedstone Granite Quarry (Cherenzia Quarry), Westerly, Washington County, Rhode Island, USA
65.8km (40.9 miles) ⓘSullivan Quarry (Armetta Quarry; Copar Quarry; Westerly Granite Co. Quarry), Bradford, Westerly, Washington County, Rhode Island, USA
98.3km (61.1 miles) ⓘTilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
References
Zodac, Peter. (1940) A Chlorophane Occurrence Near East Hampton, Conn. Rocks & Minerals: 15(11): 376.
Schooner, Richard. (1958) THE MINERALOGY OF THE PORTLAND-EAST HAMPTON-MIDDLETOWN-HADDAM AREA IN CONNECTICUT (With a few notes on Glastonbury and Marlborough)
Schooner, Richard. (1961): THE MINERALOGY OF CONNECTICUT.
Kosnar, Richard A. (1979) What's New in Colorado Minerals?. The Mineralogical Record, 10 (6) 329-332
 
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